642600440 has 16 divisors (see below), whose sum is σ = 1445851080. Its totient is φ = 257040160.

The previous prime is 642600437. The next prime is 642600443. The reversal of 642600440 is 44006246.

It is an interprime number because it is at equal distance from previous prime (642600437) and next prime (642600443).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642600443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8032466 + ... + 8032545.

Almost surely, 2^642600440 is an apocalyptic number.

It is an amenable number.

642600440 is an abundant number, since it is smaller than the sum of its proper divisors (803250640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

642600440 is a wasteful number, since it uses less digits than its factorization.

642600440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16065022 (or 16065018 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 26.

The square root of 642600440 is about 25349.5648877846. The cubic root of 642600440 is about 862.9394816908.

Adding to 642600440 its reverse (44006246), we get a palindrome (686606686).

The spelling of 642600440 in words is "six hundred forty-two million, six hundred thousand, four hundred forty".